使用“ HasConversion（）”或任何其他方法将字符串转换为Fluent API（EF Core）中的HierarchyId？

问题描述 投票：0回答：1

我正在使用具有EF Core Code First方法的FileTables。我已使用存储过程以字符串形式从FileTable（名为“ DocumentStore”）获取Path_Locator（PK），现在尝试将其插入另一个表中，以存储有关该文件的信息。我已经在使用代码优先迁移引用FileTable的表中手动添加了外键约束。因此，我想添加检索到的Path_Locator（作为字符串）以插入到另一个表中。但是这里的问题是我检索了字符串中的值，但是外键约束的类型为hierarchyid。

这是我在DbContext类中添加的方式

builder.Entity<ArticleFiles>(entity => {
     entity.Property(x => x.PathLocator).HasColumnType("hierarchyid");
});

以下是堆栈跟踪：

    Microsoft.EntityFrameworkCore.Database.Command[20102]
      Failed executing DbCommand (87ms) [Parameters=[@p0='?' (DbType = Int32), @p1='?' (Size = 450), @p2='?' (Size = 4000), @p3='?' (Size = 4000), @p4='?' (DbType = Int32), @p5='?' (Size = 450), @p6='?' (DbType
 = Boolean)], CommandType='Text', CommandTimeout='30']
      SET NOCOUNT ON;
      INSERT INTO [ArticleFiles] ([ArticleId], [PathLocator], [FileDescription], [FileName], [FileTypeId], [GeneratedFileName], [IsAttachment])
      VALUES (@p0, @p1, @p2, @p3, @p4, @p5, @p6);
fail: Microsoft.EntityFrameworkCore.Update[10000]
      An exception occurred in the database while saving changes for context type 'PublicationFinal.Data.DataContext'.
      Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details.
       ---> Microsoft.Data.SqlClient.SqlException (0x80131904): A .NET Framework error occurred during execution of user-defined routine or aggregate "hierarchyid":
      Microsoft.SqlServer.Types.HierarchyIdException: 24001: SqlHierarchyId.Parse failed because the input string '0xFD92800AD195392FF75255D5F1E836FB6FD89006BFD8987C037B7061F86242EF9612661F45F8F1084C' is not a
valid string representation of a SqlHierarchyId node.
      Microsoft.SqlServer.Types.HierarchyIdException:
         at Microsoft.SqlServer.Types.SqlHierarchyId.Parse(SqlString input)
      .
      The statement has been terminated.
         at Microsoft.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__164_0(Task`1 result)
         at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
         at System.Threading.Tasks.Task.<>c.<.cctor>b__274_0(Object obj)
         at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
      --- End of stack trace from previous location where exception was thrown ---
         at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
         at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
      --- End of stack trace from previous location where exception was thrown ---
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
      ClientConnectionId:f2ef6681-7b4c-41bb-b313-b8c6acbfd34a
      Error Number:6522,State:2,Class:16
         --- End of inner exception stack trace ---
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IList`1 entriesToSave, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(DbContext _, Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
         at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded, CancellationToken cancellatio
nToken)
         at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details.
 ---> Microsoft.Data.SqlClient.SqlException (0x80131904): A .NET Framework error occurred during execution of user-defined routine or aggregate "hierarchyid":
Microsoft.SqlServer.Types.HierarchyIdException: 24001: SqlHierarchyId.Parse failed because the input string '0xFD92800AD195392FF75255D5F1E836FB6FD89006BFD8987C037B7061F86242EF9612661F45F8F1084C' is not a valid
string representation of a SqlHierarchyId node.
Microsoft.SqlServer.Types.HierarchyIdException:
   at Microsoft.SqlServer.Types.SqlHierarchyId.Parse(SqlString input)
.
The statement has been terminated.
   at Microsoft.Data.SqlClient.SqlCommand.<>c.<ExecuteDbDataReaderAsync>b__164_0(Task`1 result)
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__274_0(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
ClientConnectionId:f2ef6681-7b4c-41bb-b313-b8c6acbfd34a
Error Number:6522,State:2,Class:16
   --- End of inner exception stack trace ---
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IList`1 entriesToSave, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(DbContext _, Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded, CancellationToken cancellationToken
)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)

在将其放入数据库之前，可以在fluentapi中使用某种方法将该字符串转换为HierarchyId吗？

c# sql-server entity-framework-core ef-code-first filetable
1个回答
0
投票

我想您需要字符串功能，但请尝试完全回答。

您可以在新的列或临时表中将architectureid转换为字符串，然后使用它。

例如，如果您有此表：

 CREATE TABLE SimpleDemo  
(
    Level hierarchyid NOT NULL,  
    Location nvarchar(30) NOT NULL,  
    LocationType nvarchar(9) NULL
);
Go
INSERT SimpleDemo  
    VALUES   
('/1/', 'Europe', 'Continent'),  
('/2/', 'South America', 'Continent'),  
('/1/1/', 'France', 'Country'),  
('/1/1/1/', 'Paris', 'City'),  
('/1/2/1/', 'Madrid', 'City'),  
('/1/2/', 'Spain', 'Country'),  
('/3/', 'Antarctica', 'Continent'),  
('/2/1/', 'Brazil', 'Country'),  
('/2/1/1/', 'Brasilia', 'City'),  
('/2/1/2/', 'Bahia', 'State'),  
('/2/1/2/1/', 'Salvador', 'City'),  
('/3/1/', 'McMurdo Station', 'City');
Go

您可以找到类似的结果：

SELECT CAST(Level AS nvarchar(100)) AS [Converted Level], *   
    FROM SimpleDemo ORDER BY Level

您可以使用function：

Select Level.ToString()
From SimpleDemo

希望对您有所帮助

如果要使用c＃函数转换此architectureid，则可以使用此代码，但应安装SSDT，SQLCLIENT：

using System;  
using System.Collections;  
using System.Text;  
using Microsoft.SqlServer.Server;  // SqlFunction Attribute
using Microsoft.SqlServer.Types;   // SqlHierarchyId

public partial class HierarchyId_Operations  
{  
    [SqlFunction(FillRowMethodName = "FillRow_ListAncestors")]
    public static IEnumerable ListAncestors(SqlHierarchyId h)
    {  
        while (!h.IsNull)  
        {  
            yield return (h);  
            h = h.GetAncestor(1);  
        }  
    }  
    public static void FillRow_ListAncestors(
        Object obj,
        out SqlHierarchyId ancestor
        )
    {  
        ancestor = (SqlHierarchyId)obj;  
    }  

    public static HierarchyId CommonAncestor(
        SqlHierarchyId h1,
        HierarchyId h2
        )  
    {  
        while (!h1.IsDescendantOf(h2))  
            h1 = h1.GetAncestor(1);  

        return h1;  
    }  
}

您可以找到此样本in here

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